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x in (-oo:+oo)
1 = (5/7)*x+31 // - (5/7)*x+31
1-((5/7)*x)-31 = 0
(-5/7)*x-31+1 = 0
-5/7*x-30 = 0 // + 30
-5/7*x = 30 // : -5/7
x = 30/(-5/7)
x = -42
x = -42
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